What is the difference between a hot Jupiter and a cold Jupiter?
A) Hot Jupiters have fusion reactions; cold Jupiters do not.
B) Hot Jupiters orbit close to the parent stars; cold Jupiters do not.
C) Hot Jupiters radiate more energy than they receive from their star; cold Jupiters do not.
D) Hot Jupiters have observed volcanoes; cold Jupiters do not.
E) Hot Jupiters were an exciting discovery; cold Jupiters were not.
B
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A 500-turn circular loop 15.0 cm in diameter is initially aligned so that its axis is parallel to the Earth's magnetic field. In 2.77 ms the coil is flipped so that its axis is perpendicular to the Earth's field. If a voltage of 0.166 V is induced in the coil, what is the value of the Earth's magnetic field?
Spectral Series: What value of n corresponds to a wavelength of 91.7 nm in the Lyman series?
A. 1 B. 3 C. 5 D. 9 E. 13
Figure 4–53 shows a block (mass mA) on a smooth horizontal surface, connected by a thin cord that passes over a pulley to a second block which hangs vertically.
(a) Draw a free-body diagram for each block, showing the force of gravity on each, the force (tension) exerted by the cord, and any normal force.
(b) Apply Newton’s second law to find formulas for the acceleration of the system and for the tension in the cord. Ignore friction and the masses of the pulley and cord.
A satellite that weighs 4900 N on the launchpad travels around the earth's equator in a circular orbit with a period of 1.667 h. The earth's mass is 5.97 × 1024 kg, its equatorial radius is 6.3 × 106 m, and G = 6.67 × 10-11 N ? m2/kg2
(a) Calculate the magnitude of the earth's gravitational force on the satellite. (b) Determine the altitude of the satellite above the Earth's SURFACE.